Pump operated by compressed air.



PATENTED JAN. 14, 1908.

2 SHEETSSHEET 1.

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DANVILL W. STARRETT, OF SAN FRANCISCO, CALIFORNIA.

PUMP OPERATED BY COMPRESSED AIR.

Specification of Letters Patent.

Patented Jan. 14, 1908.

Application filed April 27. 1904:. Serial No. 205.128. Renewed April 12.1907. Serial No. 367.803.

To all whom it may concern:

Be it known that I, DANVILL W. STARRETT, a citizen of the United States,residing at San Francisco, inthe county of San Francisco and State ofCalifornia, have invented certain new and useful Improvements in Pumps 0erated by Compressed Air, of which the fo lowing is a specification.

My invention relates to improvements in pumps operated by compressedair, the object of my invention being to provide a simple form of pumpoperated by compressed air by means of which water may be elevated toany height by means of compressed air at any pressure greater than theatmosphere.

My invention belongs to that class described and claimed by me in UnitedStates Letters Patent granted to me May 29th, 1906, No. 821,677 in whichthere is provided in the water discharge pipe a check valve, and to saiddischarge pipe above the check valve there leads a branch from thecompressed air pipe, in which branch the opening is sufficiently large,having regard to the height of the discharge pipe and the pressure ofthe compressed air, to admit a sufficiently large proportion of air towater to distribute the water through the whole length of the pipe tosuch an extent that the weight of the entire amount of water shall notoverbalance the pressure of the compressed air;' whereby when waterescapes from the top of the discharge pipe the pressure of thecompressed air may be utilized to force water through the check valveinto the discharge pipe to supply the place of that which has beendischarged from the top thereof.

This invention consists of -a simple construction for effecting theabove results.

An especial object of my present invention is to provide such aconstruction by means of which the air after being utilized to forcewater through the check valve may be introducedinto the water dischargepipe to assist in lifting the water.

i In the accompanying drawings, Figure 1 is a vertical section of theapparatus, certain'of the pipes however being shown in side elevation;Fig. 2 is a side elevation of the upper portion of the apparatus; Fig. 3is a horizontal section on the line A--A of Fig. 1; Figs. 4 and 5 areviews similar to Figs. 1 and 2 of a modified form. of the apparatus;Fig. 6 is a vertical section of the reducing valve.

Referring to the drawing, 1 represents the compressed air pipe, 2 thewater discharge pipe and. 3 the water suction pipe.

4 represents a common steam pump comprising a steam cylinder 5 and apumping cylinder 6. In the present instance the steam pump is preferablyoperated by means of compressed air. The piston 7 and 8 in thesecylinders are of substantially the same diam eter and are connected by apiston rod 9.

10 is the valve chamber having the valve 11 therein operated from thepiston rod 9 by the lever 12, links 13 and rod 14;.

15 represents a chamber divided into upper and lower portions by ahorizontal partition 16, the lower portion being again divided by avertical partltion 17 into compartments 18 and 19, connectedrespectively with the upper and lower ends of the pumping cylinder.These compartments contain inlet valves 20, 21. The upper portion orcompartment 22 contains check valves 23, 24, communicating respectivelywith the compartments 18 19.

25 represents a branch or jet pipe leading from the compressed air pipeto the water discharge pipe and having therein anadjustable check valve26. Beyond saidcheck valve there is provided a nozzle 27which'discharges the compressed air into said branch pipe 25 opposite tothe entrance of an exhaust pipe 28 leading from the exhaust chamber 29of the pump and'having therein a pet-cock 30 The operation of theapparatus is as follows. Supposing the parts to be in the position shownin Fig. 1, the air entering the upper portion of the-cylinder 51forcesthe piston 7 downwards, likewise forcing down the piston 8 and drawingwater from the pipe 3 through the valve 20 into the chamber 18 andthence to the upper end of the pumping cylinder 6. Upon the returnstrokeof the pistoncaused by the admission of compressed air to the lower endof the cylinder 5, the water in the upper portion of the pumpingcylinder is forced back into the compartment 18, and thence through thevalve 23 into the compartment 22. At the same time water is being drawnthrough the valve 21 into the compartment 19 and thence into the lowerend of the pumping cylinder, which, again. on the return stroke of thepiston, is forced through thevalve 24 into the chamber 22. During thewhole of this operation compressed air is also passing through thebranch pipe 25 into the water discharge pipe, and it is only when theamount of air so forced through said branch or jet pipe is sufiicient todistribute the water along the discharge pipe to such an extent that thepressure of the whole of the water therein upon the valves 23, 24 isless than the pressure of the compressed air, that any Water passesthrough As soon as water is discharged of the continuedflow of thecompressed air into the bottom of said discharge pipe, then immediatelythe pump begins to work and water is forced through the valves 23, 24,

into the discharge pipe to supply the place of the water that had beendischarged frointhe top of said pipe. The exhaust air of the pump afterperforming its ofiice of driving the piston is permitted to'flow intothe water discharge pipe 2, and it is in order to avoid any backpressure that the nozzle 27 is provided, since it assists the passage ofthe air from the exhaust chamber to said water dis charge pipe. By thismeans the air of the pump is utilized to lift the water in'the waterdischarge pipe.

Figs. 4, 5 and 6 show a modification in which the piston of the steamcylinder is of greater area than that of the pumping cylinder. In thiscase therefore it is necessary to reduce the pressure of the air supplyto the steam cylinder. Thisis done by means of the throttle valve 31,shown in detail in Fig. 6. It'would be possible to, make the piston ofthe steam cylinder of less area than that ofthe pumping cylinder in likemanner except that in this case the throttle valve should be placed inthe branch pipe leading from the compressed air pipe to the waterdischarge pipe.

The pet-cock 30' can be used to reduce the pressure very low, ifdesired, when economy is-not of the first importance.

I do not claim herein matter claimed by me in a copending applicationSerial N 0.

367,071, filed April 8th, 1907, confining my- Self in the presentapplication to the specific claims here made.

I claim 1. In an apparatus ofthe character described, the combination ofthe compressed air pipe, the water discharge pipe, the inlet valve forthe water, the check valve therefor at the bottom of said waterdischarge pipe, a

pump discharging into the space between the inlet and check valves andhaving a piston operated by the compressed air, a passage from thecompressed air pipe to the water discharge pipe sufficiently large inrelation to v the compressed air pressure and the height of thedischarge pipe to distribute the water therein sufficiently to reducethe weight of from the compressed air the water upon the check valvebelow the compressed air pressure whereby said pressure can operate topump water through said check valve, and an exhaust pipe leading to saidpassage from the exhaust chamber of the pump, substantially asdescribed.

'2. In an apparatus of thecharacter described, the combination of thecompressed air pipe, the water discharge pipe, the inlet valve for thewater, the check valve therefor at the bottom of said water dischargepipe, a pump'discharging into the space between the inlet and checkvalves and having a piston operated by the compressd air, a passage ipeto the water discharge pipe sufficiently arge in relation. to

the compressed air pressure and the height.

the air along said exhaust pipe, substantially as described.

3. In an ap paratus of the character described, the combination of a comressed air pipe, a water discharge pipe, an in et'valve, a check valveat the bottom of the water discharge pipe, and a pair. of cylindershaving pistons't erein of unequal. diameters, said pistons beingconnected. to work in unison,

one of said cylinders being connectedwith the and the compressed airpressure to distribute the water in said discharge pipe sufficiently toreduce theweight of the water upon the check valve below the compressedair pressure, whereby said pressure can operate said pistons to forcewater through said check valves, substantially as described.

In witness whereof I have hereunto set my hand in the presence of twosubscribing witnesses' DANVILL W STARRETT Witnesses:

"FRANCIS W. WRIGHT,-

BESSIE GORFINKEL.

